A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 151, CARLSBAD, NM 88221-0151
PO BOX 152, CARLSBAD, NM 88221-0152
PO BOX 153, CARLSBAD, NM 88221-0153
PO BOX 154, CARLSBAD, NM 88221-0154
PO BOX 155, CARLSBAD, NM 88221-0155
PO BOX 156, CARLSBAD, NM 88221-0156
PO BOX 157, CARLSBAD, NM 88221-0157
PO BOX 158, CARLSBAD, NM 88221-0158
PO BOX 159, CARLSBAD, NM 88221-0159
PO BOX 160, CARLSBAD, NM 88221-0160
PO BOX 161, CARLSBAD, NM 88221-0161
PO BOX 162, CARLSBAD, NM 88221-0162
PO BOX 163, CARLSBAD, NM 88221-0163
PO BOX 164, CARLSBAD, NM 88221-0164
PO BOX 165, CARLSBAD, NM 88221-0165
PO BOX 166, CARLSBAD, NM 88221-0166
PO BOX 167, CARLSBAD, NM 88221-0167
PO BOX 168, CARLSBAD, NM 88221-0168
PO BOX 169, CARLSBAD, NM 88221-0169
PO BOX 170, CARLSBAD, NM 88221-0170
PO BOX 171, CARLSBAD, NM 88221-0171
PO BOX 172, CARLSBAD, NM 88221-0172
PO BOX 173, CARLSBAD, NM 88221-0173
PO BOX 174, CARLSBAD, NM 88221-0174
PO BOX 175, CARLSBAD, NM 88221-0175
PO BOX 176, CARLSBAD, NM 88221-0176
PO BOX 177, CARLSBAD, NM 88221-0177
PO BOX 178, CARLSBAD, NM 88221-0178
PO BOX 179, CARLSBAD, NM 88221-0179
PO BOX 180, CARLSBAD, NM 88221-0180
PO BOX 181, CARLSBAD, NM 88221-0181
PO BOX 182, CARLSBAD, NM 88221-0182
PO BOX 183, CARLSBAD, NM 88221-0183
PO BOX 184, CARLSBAD, NM 88221-0184
PO BOX 185, CARLSBAD, NM 88221-0185
PO BOX 186, CARLSBAD, NM 88221-0186
PO BOX 187, CARLSBAD, NM 88221-0187
PO BOX 188, CARLSBAD, NM 88221-0188
PO BOX 189, CARLSBAD, NM 88221-0189
PO BOX 190, CARLSBAD, NM 88221-0190
PO BOX 191, CARLSBAD, NM 88221-0191
PO BOX 192, CARLSBAD, NM 88221-0192
PO BOX 193, CARLSBAD, NM 88221-0193
PO BOX 194, CARLSBAD, NM 88221-0194
PO BOX 195, CARLSBAD, NM 88221-0195
PO BOX 196, CARLSBAD, NM 88221-0196
PO BOX 197, CARLSBAD, NM 88221-0197
PO BOX 198, CARLSBAD, NM 88221-0198
PO BOX 199, CARLSBAD, NM 88221-0199
PO BOX 200, CARLSBAD, NM 88221-0200
PO BOX 201, CARLSBAD, NM 88221-0201
PO BOX 202, CARLSBAD, NM 88221-0202
PO BOX 203, CARLSBAD, NM 88221-0203
PO BOX 204, CARLSBAD, NM 88221-0204
PO BOX 205, CARLSBAD, NM 88221-0205
PO BOX 206, CARLSBAD, NM 88221-0206
PO BOX 207, CARLSBAD, NM 88221-0207
PO BOX 208, CARLSBAD, NM 88221-0208
PO BOX 209, CARLSBAD, NM 88221-0209
PO BOX 210, CARLSBAD, NM 88221-0210
PO BOX 211, CARLSBAD, NM 88221-0211
PO BOX 212, CARLSBAD, NM 88221-0212
PO BOX 213, CARLSBAD, NM 88221-0213
PO BOX 214, CARLSBAD, NM 88221-0214
PO BOX 215, CARLSBAD, NM 88221-0215
PO BOX 216, CARLSBAD, NM 88221-0216
PO BOX 217, CARLSBAD, NM 88221-0217
PO BOX 218, CARLSBAD, NM 88221-0218
PO BOX 219, CARLSBAD, NM 88221-0219
PO BOX 220, CARLSBAD, NM 88221-0220
PO BOX 221, CARLSBAD, NM 88221-0221
PO BOX 222, CARLSBAD, NM 88221-0222
PO BOX 223, CARLSBAD, NM 88221-0223
PO BOX 224, CARLSBAD, NM 88221-0224
PO BOX 225, CARLSBAD, NM 88221-0225
PO BOX 226, CARLSBAD, NM 88221-0226
PO BOX 227, CARLSBAD, NM 88221-0227
PO BOX 228, CARLSBAD, NM 88221-0228
PO BOX 229, CARLSBAD, NM 88221-0229
PO BOX 230, CARLSBAD, NM 88221-0230
PO BOX 231, CARLSBAD, NM 88221-0231
PO BOX 232, CARLSBAD, NM 88221-0232
PO BOX 233, CARLSBAD, NM 88221-0233
PO BOX 234, CARLSBAD, NM 88221-0234
PO BOX 235, CARLSBAD, NM 88221-0235
PO BOX 236, CARLSBAD, NM 88221-0236
PO BOX 237, CARLSBAD, NM 88221-0237
PO BOX 238, CARLSBAD, NM 88221-0238
PO BOX 239, CARLSBAD, NM 88221-0239
PO BOX 240, CARLSBAD, NM 88221-0240
PO BOX 241, CARLSBAD, NM 88221-0241
PO BOX 242, CARLSBAD, NM 88221-0242
PO BOX 243, CARLSBAD, NM 88221-0243
PO BOX 244, CARLSBAD, NM 88221-0244
PO BOX 245, CARLSBAD, NM 88221-0245
PO BOX 246, CARLSBAD, NM 88221-0246
PO BOX 247, CARLSBAD, NM 88221-0247
PO BOX 248, CARLSBAD, NM 88221-0248
PO BOX 249, CARLSBAD, NM 88221-0249
PO BOX 250, CARLSBAD, NM 88221-0250
PO BOX 251, CARLSBAD, NM 88221-0251
PO BOX 252, CARLSBAD, NM 88221-0252
PO BOX 253, CARLSBAD, NM 88221-0253
PO BOX 254, CARLSBAD, NM 88221-0254
PO BOX 255, CARLSBAD, NM 88221-0255
PO BOX 256, CARLSBAD, NM 88221-0256
PO BOX 257, CARLSBAD, NM 88221-0257
PO BOX 258, CARLSBAD, NM 88221-0258
PO BOX 259, CARLSBAD, NM 88221-0259
PO BOX 260, CARLSBAD, NM 88221-0260
PO BOX 261, CARLSBAD, NM 88221-0261
PO BOX 262, CARLSBAD, NM 88221-0262
PO BOX 263, CARLSBAD, NM 88221-0263
PO BOX 264, CARLSBAD, NM 88221-0264
PO BOX 265, CARLSBAD, NM 88221-0265
PO BOX 266, CARLSBAD, NM 88221-0266
PO BOX 267, CARLSBAD, NM 88221-0267
PO BOX 268, CARLSBAD, NM 88221-0268
PO BOX 269, CARLSBAD, NM 88221-0269
PO BOX 270, CARLSBAD, NM 88221-0270
PO BOX 271, CARLSBAD, NM 88221-0271
PO BOX 272, CARLSBAD, NM 88221-0272
PO BOX 273, CARLSBAD, NM 88221-0273
PO BOX 274, CARLSBAD, NM 88221-0274
PO BOX 275, CARLSBAD, NM 88221-0275
PO BOX 276, CARLSBAD, NM 88221-0276
PO BOX 277, CARLSBAD, NM 88221-0277
PO BOX 278, CARLSBAD, NM 88221-0278
PO BOX 279, CARLSBAD, NM 88221-0279
PO BOX 280, CARLSBAD, NM 88221-0280
PO BOX 281, CARLSBAD, NM 88221-0281
PO BOX 282, CARLSBAD, NM 88221-0282
PO BOX 283, CARLSBAD, NM 88221-0283
PO BOX 284, CARLSBAD, NM 88221-0284
PO BOX 285, CARLSBAD, NM 88221-0285
PO BOX 286, CARLSBAD, NM 88221-0286
PO BOX 287, CARLSBAD, NM 88221-0287
PO BOX 288, CARLSBAD, NM 88221-0288
PO BOX 289, CARLSBAD, NM 88221-0289
PO BOX 290, CARLSBAD, NM 88221-0290
PO BOX 291, CARLSBAD, NM 88221-0291
PO BOX 292, CARLSBAD, NM 88221-0292
PO BOX 293, CARLSBAD, NM 88221-0293
PO BOX 294, CARLSBAD, NM 88221-0294
PO BOX 295, CARLSBAD, NM 88221-0295
PO BOX 296, CARLSBAD, NM 88221-0296
PO BOX 297, CARLSBAD, NM 88221-0297
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